CN204731317U - A kind of intelligentized earth resistance tester - Google Patents

A kind of intelligentized earth resistance tester Download PDF

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Publication number
CN204731317U
CN204731317U CN201520406475.0U CN201520406475U CN204731317U CN 204731317 U CN204731317 U CN 204731317U CN 201520406475 U CN201520406475 U CN 201520406475U CN 204731317 U CN204731317 U CN 204731317U
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China
Prior art keywords
connects
unit
computer control
chip computer
intelligentized
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CN201520406475.0U
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Chinese (zh)
Inventor
孙中梁
毛协国
刘余平
伍先德
李正元
龚静
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上海臻和防雷电气技术有限责任公司
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Abstract

The utility model provides a kind of intelligentized earth resistance tester, for detecting the stake resistance of tested ground loop, comprise single-chip computer control system, single-chip computer control system connects filter unit, and filter unit connects power amplifier, and power amplifier connects voltage generator, tested ground loop connects voltage generator and current detecting unit, voltage generator connects bleeder circuit, and bleeder circuit connects voltage sampling unit, and voltage sampling unit connects single-chip computer control system; Current detecting unit connects current amplifier, and current amplifier connects filter unit, and filter unit connects single-chip computer control system.Sensor first gives tested ground loop excitation pulse signal, tested ground loop responds to a pulse electromotive force E, at tested ground loop generation current I, will can obtain tested ground loop resistance by formula R=E/I under the effect of electromotive force E.Instrument can Real-Time Monitoring stake resistance, has high precision, high stability, high reliability.

Description

A kind of intelligentized earth resistance tester

Technical field

The utility model relates to a kind of intelligentized earth resistance tester, belongs to intelligent instrument technical field.

Background technology

The distribution such as generating plant, transformer station, communication base station, lightning protection are the important measures safeguarded power system security reliability service, ensure electrical equipment and operations staff's safety, be in electrical network power equipment from the important salvo of overvoltage injury.Imperfect earth not only can threaten the safe operation of electrical network, causes tremendous economic to lose, and meeting serious threat personal safety, and therefore, insulating resistance measuring is indispensable content in electrical engineering.Earthing electric network and electrode all can have different changes every year because of corrosion, the grounding resistance therefore for grounded screen will regularly detect, and see that whether it is beyond normal range.

At present the detection of stake resistance is mainly measured by traditional megger formula, imitative megger formula digital resistance instrument, the pincerlike earth resistance tester of hand-held by human at periodic intervals, cannot Timeliness coverage fault, be more difficult to the larger defect finding to produce fault.

Adopt traditional megger formula or imitative megger formula digital resistance instrument to monitor stake resistance and also there is the shortcomings such as accuracy of detection is low, real-time is inadequate.In order to improve the degree of accuracy of monitoring, monitoring grounding resistance condition and fixing a breakdown in real time, networking, long-range, intelligent on-line monitoring seem particularly important.

Along with the application of electronic technology in civil electrical system is more and more extensive, the development of adjoint network, infotech, provide technology possibility to the functional promotion of insulating resistance measuring, the utility model is developed just under this new demand, New Technical Condition.

Utility model content

The technical problems to be solved in the utility model be to provide a kind of can in real time, the earth resistance tester of accurately monitoring grounding resistance condition.

In order to solve the problems of the technologies described above, the technical solution of the utility model is to provide a kind of intelligentized earth resistance tester, for detecting the stake resistance of tested ground loop, it is characterized in that: comprise single-chip computer control system, single-chip computer control system connects filter unit, filter unit connects power amplifier, power amplifier connects voltage generator, tested ground loop connects voltage generator and current detecting unit, voltage generator connects bleeder circuit, bleeder circuit connects voltage sampling unit, and voltage sampling unit connects single-chip computer control system; Current detecting unit connects current amplifier, and current amplifier connects filter unit, and filter unit connects single-chip computer control system.

Preferably, described single-chip computer control system connection data storage unit, hardware clock unit, watchdog unit, RS485 communication unit and human-computer interaction interface.

Preferably, described single-chip computer control system connect be used for showing the resistance value detected on the spot liquid crystal display, for the key input unit of preset inefficacy resistance value and send the work warning indicating member that sound and light alarm indicates when ground connection situation exceeds setting inefficacy resistance value.

Preferably, described RS485 communication unit is connected with described single-chip computer control system by Phototube Coupling unit.

Preferably, the analog input loop of described single-chip computer control system is provided with transition diode.

Testing process of the present utility model is: single-chip computer control system triggers and produces excitation pulse signal, excitation pulse signal enters power amplifier after unit after filtering and carries out power amplification, reload on voltage generator, excitation pulse signal after voltage generator amplifies to tested ground loop one, pass through bleeder circuit simultaneously, excitation pulse signal amplitude is fed back to single-chip computer control system by voltage sampling unit, now on tested ground loop, respond to a pulse electromotive force E, induction current I is produced in tested loop under the effect of electromotive force E, pass through electric current detecting coil, current I signal is collected, amplify through signal, single-chip computer control system is entered after active power filtering, the electromotive force E now produced by the excitation pulse signal collected in single-chip computer control system and induction current I signal are screened by useful data, using formula after error correction: R=E/I carries out computing, just can obtain loop stake resistance data.Data are shown on the spot by liquid crystal display, externally transmit data, by RS485 network by data remote by single-chip computer control system programmed control serial ports simultaneously.

Compared with prior art, the utility model has following beneficial effect:

(1) test process is without the need to disconnecting ground loop, one-step installation, long term monitoring.

(2) testing apparatus and tested grounded part are without electrical connection, there is not the mutual cross-interference issue of superpotential, guarantee that equipment individual secure runs.

(3) system earth protection Intelligent monitoring device power supply adopts autonomous power supply system, has effectively isolated external electromagnetic crosstalk and surge interference, has applied energy intelligent management simultaneously, effectively can reduce energy consumption, improve the reliability of system.

(4) equipment is without the need to self-inspection, possesses the RS485Modbus-RTU communication of isolation, realizes image data transmission, improve security of system, real-time detection, coordinates upper computer control system, can realize remote data monitoring, fault pre-alarming, operation conditions and fault analysis.

(5) system earth protection Intelligent monitoring device built-in sensors and circuit board; there is anti-rain, dust-proof, high-low temperature resistant, the characteristic such as anticorrosion, fire-retardant; equipment protection grade reaches IP65; high and low temperature environment can be adapted to, meet outdoor mounted completely; meet safety requirements requirement, under guaranteeing field, mine, high precision, high stability, the high reliability of the long-time on-line monitoring such as indoor.

Accompanying drawing explanation

The system chart of the intelligentized earth resistance tester that Fig. 1 provides for the utility model;

The application drawing of the intelligentized earth resistance tester that Fig. 2 provides for the utility model.

Embodiment

For making the utility model become apparent, hereby with a preferred embodiment, and accompanying drawing is coordinated to be described in detail below.

Intelligentized earth resistance tester ultimate principle is measuring circuit resistance, sensor first gives tested ground loop excitation pulse signal, tested ground loop responds to a pulse electromotive force E, will at tested ground loop generation current I under the effect of electromotive force E.Sensor is measured E and I, and passes through formula: R=E/I can obtain tested ground loop resistance.

The system chart of the intelligentized earth resistance tester that Fig. 1 provides for the utility model, system is primarily of part compositions such as voltage generator, current amplifier, filtering circuit, sample circuit, singlechip controller, ROM, RAM, FLASH data-carrier store, hardware clock circuit, watchdog circuit, RS-485 communication interface, input through keyboard, liquid crystal display.

Its testing process is: single-chip computer control system triggers and produces excitation pulse signal, excitation pulse signal enters power amplifier after circuit after filtering and carries out power amplification, reload on potential winding, excitation pulse signal after potential winding amplifies to tested ground loop one, pass through bleeder circuit simultaneously, excitation pulse signal amplitude is fed back to single-chip computer control system by voltage sampling circuit, now on tested ground loop, respond to a pulse electromotive force E, induction current I is produced in tested loop under the effect of electromotive force E, pass through electric current detecting coil, current I signal is collected, amplify through signal, single-chip computer control system is entered after active power filtering, the electromotive force E now produced by the excitation pulse signal collected in single-chip computer control system and induction current I signal are screened by useful data, using formula after error correction: R=E/I carries out computing, just can obtain loop stake resistance data, data are shown on the spot by instrument liquid crystal display, externally transmit data by single-chip computer control system programmed control serial ports simultaneously, by RS485 network by data remote.

Equipment power supply mode: stake resistance online acquisition unit can be guided to by external communication 220V power supply, be powered to stake resistance online acquisition unit by power supply adaptor; Also configurable accumulator is powered to stake resistance online acquisition unit, simultaneously configurable solar panel, cannot the place accumulators of power taking and stake resistance online acquisition unit power.

Equipment simulating amount input circuit is provided with the high voltage straining elements such as transition diode, prevents other loop of high voltage access to plant, realizes input overvoltage protection.

Gather stake resistance parameter in real time and be regularly stored in the storer of self, possessing and implement storage, power-down protection.

Equipment adopts the measures such as hardware, software watchdog and disable instruction interruption, guarantees that system can autoboot self-inspection under abnomal condition.

Testing apparatus is provided with human-computer interaction interface, system clock unit and work warning indicating member.Human-computer interaction interface adopts widescreen Chinese character LCD display module directly to show the resistance value of detection on the spot, and to be reported to the police critical value by keyboard to set up, stake resistance online acquisition unit can preset inefficacy resistance value on the spot, and when ground connection situation exceeds setting inefficacy resistance value, sound and light alarm indicates.

System has out-of-limit event and historical data recollects function, out-of-limit event in chronological sequence order display, and historical data is by the time period display of artificial input.

Testing apparatus connects RS485 communication unit, has communication function.RS485 communication unit have employed Phototube Coupling, the measures such as lightning protection.

The application drawing of the intelligentized earth resistance tester that Fig. 2 provides for the utility model, the intelligentized earth resistance tester (1 of three covers in figure, 2, 3) A is each passed through, B, C tri-earthing poles, A, B, C tri-earthing pole one end grounded screens, one end realizes equipotential link by cable, the RS485 signal wire of No. 3, intelligentized earth resistance tester accesses the RS485 interface of No. 2, the RS485 signal wire of No. 2 accesses the RS485 interface of No. 1, be connected with RS485 bus through the RS485 interface of No. 1 again, realize " handing in hand " to connect, the stake resistance parameter detected is through RS485 communicator, by RS232 converting interface access computing machine, realize real time data by the upper computer software of exploitation to detect, simultaneously can Ethernet, optical fiber networking data are transmitted, to A, B, the ground loop that C tri-earthing poles are formed is monitored, set up on monitoring backstage and store and monitoring system, be grounded state analysis and hidden danger judgement.

The intelligentized earth resistance tester that the utility model provides is on-line testing, non-cpntact measurement, and ground wire punching is passed through, and does not affect the normal operation of lightning protection effect and facility.Jamproof real-time detection can be realized, for smart power grid user end provide long-range, the intellectual monitoring scheme of real-time online measuring stake resistance, to the on-line measurement of stake resistance, dynamic monitoring, safety analysis, the situation that the stake resistance of earthed system is degenerated, have a strong impact on ground connection earial drainage effect and the voltage endurance capability of resistance to stream is given warning in advance, can effectively avoid because earthing failure causes very big destructive lightning strike accident, prevention economic loss, guarantees personal safety.

Claims (5)

1. an intelligentized earth resistance tester, for detecting the stake resistance of tested ground loop, it is characterized in that: comprise single-chip computer control system, single-chip computer control system connects filter unit, and filter unit connects power amplifier, and power amplifier connects voltage generator, tested ground loop connects voltage generator and current detecting unit, voltage generator connects bleeder circuit, and bleeder circuit connects voltage sampling unit, and voltage sampling unit connects single-chip computer control system; Current detecting unit connects current amplifier, and current amplifier connects filter unit, and filter unit connects single-chip computer control system.
2. a kind of intelligentized earth resistance tester as claimed in claim 1, is characterized in that: described single-chip computer control system connection data storage unit, hardware clock unit, watchdog unit, RS485 communication unit and human-computer interaction interface.
3. a kind of intelligentized earth resistance tester as claimed in claim 2, is characterized in that: described single-chip computer control system connect be used for showing the resistance value detected on the spot liquid crystal display, for the key input unit of preset inefficacy resistance value and send the work warning indicating member that sound and light alarm indicates when ground connection situation exceeds setting inefficacy resistance value.
4. a kind of intelligentized earth resistance tester as claimed in claim 2, is characterized in that: described RS485 communication unit is connected with described single-chip computer control system by Phototube Coupling unit.
5. a kind of intelligentized earth resistance tester as claimed in claim 1, is characterized in that: the analog input loop of described single-chip computer control system is provided with transition diode.
CN201520406475.0U 2015-06-12 2015-06-12 A kind of intelligentized earth resistance tester CN204731317U (en)

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105717366A (en) * 2016-01-29 2016-06-29 南京尚志电子科技有限公司 Online grounding resistance monitoring alarm and remote monitoring system
CN106370933A (en) * 2016-08-29 2017-02-01 中国地质大学(北京) High-precision inter-electrode resistance intelligent tester and use method thereof
CN106597113A (en) * 2016-11-22 2017-04-26 电子科技大学 Power line tower grounding resistance online tester based on proportion detection
CN106771638A (en) * 2016-11-22 2017-05-31 电子科技大学 A kind of power line steel tower earth resistance In-circiut tester based on current ratio detection
CN106841814A (en) * 2017-01-26 2017-06-13 江苏德大自动化设备有限公司 Earthed system earth resistance on-line monitoring system, on-line detector and monitoring method
CN107478909A (en) * 2017-07-18 2017-12-15 安徽天玄科技有限公司 A kind of smart grounding resistance on-line computing model and its system
CN108008196A (en) * 2017-11-14 2018-05-08 山东康威通信技术股份有限公司 A kind of communication cable shielding layer distal end earth resistance metering device and method
WO2018141259A1 (en) * 2017-02-04 2018-08-09 山西全安新技术开发有限公司 Grounding monitoring system, method and device, and computer-readable storage medium
CN108802498A (en) * 2018-06-22 2018-11-13 安徽北斗易通信息技术有限公司 A kind of earth resistance tester
CN109188098A (en) * 2018-09-17 2019-01-11 吉林省泰华电子股份有限公司 A kind of ground resistance on-line monitoring management system

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105717366A (en) * 2016-01-29 2016-06-29 南京尚志电子科技有限公司 Online grounding resistance monitoring alarm and remote monitoring system
CN106370933A (en) * 2016-08-29 2017-02-01 中国地质大学(北京) High-precision inter-electrode resistance intelligent tester and use method thereof
CN106597113A (en) * 2016-11-22 2017-04-26 电子科技大学 Power line tower grounding resistance online tester based on proportion detection
CN106771638A (en) * 2016-11-22 2017-05-31 电子科技大学 A kind of power line steel tower earth resistance In-circiut tester based on current ratio detection
CN106771638B (en) * 2016-11-22 2019-10-01 电子科技大学 A kind of power line steel tower ground resistance In-circiut tester based on current ratio detection
CN106597113B (en) * 2016-11-22 2019-12-10 电子科技大学 Power line iron tower ground resistance on-line tester based on proportion detection
CN106841814A (en) * 2017-01-26 2017-06-13 江苏德大自动化设备有限公司 Earthed system earth resistance on-line monitoring system, on-line detector and monitoring method
WO2018141259A1 (en) * 2017-02-04 2018-08-09 山西全安新技术开发有限公司 Grounding monitoring system, method and device, and computer-readable storage medium
CN107478909A (en) * 2017-07-18 2017-12-15 安徽天玄科技有限公司 A kind of smart grounding resistance on-line computing model and its system
CN108008196A (en) * 2017-11-14 2018-05-08 山东康威通信技术股份有限公司 A kind of communication cable shielding layer distal end earth resistance metering device and method
CN108802498A (en) * 2018-06-22 2018-11-13 安徽北斗易通信息技术有限公司 A kind of earth resistance tester
CN109188098A (en) * 2018-09-17 2019-01-11 吉林省泰华电子股份有限公司 A kind of ground resistance on-line monitoring management system

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C14 Grant of patent or utility model
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20151028

Termination date: 20180612

CF01 Termination of patent right due to non-payment of annual fee